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Cross Country Wireless High Z Antenna Amplifier

High Z antenna amplifier

The High Z Antenna Amplifier is designed to match shortened high impedance antenna elements to a 50 or 75 ohm feeder for excellent reception in the medium wave, 160 and 80m amateur radio bands with good reception from 100 kHz to 30 MHz.

In typical use the main antenna element is a 3 to 6m (10 to 20 ft) vertical rod or wire. The ground connection is a single earth or ground rod.

The voltage gain is set to unity and the amplifier offers repeatable gain and phase performance so that any number of amplifiers from 2 to 9 can be used in a directional phased array with a suitable phase switching unit.

The amplifier is housed in a polycarbonate box with stainless steel antenna connections and a BNC or F type socket. 12V DC power is fed up the feeder to power the amplifier. It can also be powered with 4.7V DC from the bias-tee in SDRPlay receivers.

Like our other active antenna products it has RF overload protection to allow it to be used very close to transmit antennas without damaging the amplifier or the attached receiver. It also has an optional diode limiter on the output to protect delicate wideband SDR receivers like the SDRPlay receiver from damage. A wire link can be cut inside the amplifier to allow it to run at full output for use with high performance receivers.

High Z antenna amplifier diode limiter jumper

The amplifier has a common mode filter on the RF output to stop noise and interference picked up on the coax feeder from entering the amplifier.


One of our customers Andy, DL8LAS has used one of our amplifiers in a low noise HF vertical antenna for his multiband CW Skimmer station. Here is a link to his web page.

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Orders for customers from the EU are now processed by eBay so that customers don't have to pay tax and a handling charge on delivery.

If EU customers pay directly in US dollars or GB pounds we cannot process the EU tax and you will have to pay the tax and handling charge on delivery.

Click here for the eBay page for this product

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UK customers can also buy via eBay. eBay send the VAT payment direct to HMRC in the UK.

Click here for the eBay page for this product

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